//#define _XOPEN_SOURCE  1
// #define _SVID_SOURCE  1
//#define _POSIX_SOURCE  1
//#define _BSD_SOURCE  1
#include <header.h>
#include <iostream>
using namespace std;

namespace wd{
    int num = 10;
    void func(){
        cout << "wd::func()" << endl;
    }
}// end of namespace wd

namespace hw{
    int num  = 20;
    void func(){
        cout << "hw:func()" << endl;
    }
}


void test0(){
    using namespace wd;
    cout << num;
}

void test1(){
    using namespace hw;
    cout << num;
}





int main(int argc, char* argv[]){
   test1();
}